US diplomatic cable made public by WikiLeaks provides evidence that US troops executed at least 10 Iraqi civilians, including a woman in her 70s and a 5-month-old infant, then called in an airstrike to destroy the evidence, during a controversial 2006 incident in the central Iraqi town of Ishaqi.

The unclassified cable, which was posted on WikiLeaks' website last week, contained questions from a United Nations investigator about the incident, which had angered local Iraqi officials, who demanded some kind of action from their government. US officials denied at the time that anything inappropriate had occurred.

But Philip Alston, the UN's special rapporteur on extrajudicial, summary or arbitrary executions, said in a communication to American officials dated 12 days after the March 15, 2006, incident that autopsies performed in the Iraqi city of Tikrit showed that all the dead had been handcuffed and shot in the head. Among the dead were four women and five children. The children were all 5 years old or younger.

Reached by email Wednesday, Alston said that as of 2010 - the most recent data he had - US officials hadn't responded to his request for information and that Iraq's government also hadn't been forthcoming. He said the lack of response from the United States "was the case with most of the letters to the US in the 2006-2007 period," when fighting in Iraq peaked.

Alston said he could provide no further information on the incident. "The tragedy," he said, "is that this elaborate system of communications is in place but the (UN) Human Rights Council does nothing to follow up when states ignore issues raised with them."

The Pentagon didn't respond to a request for comment. At the time, American military officials in Iraq said the accounts of townspeople who witnessed the events were highly unlikely to be true, and they later said the incident didn't warrant further investigation. Military officials also refused to reveal which units might have been involved in the incident.

Iraq was fast descending into chaos in early 2006. An explosion that ripped through the Golden Dome Mosque that February had set off an orgy of violence between rival Sunni and Shiite Muslims, and Sunni insurgents, many aligned with al Qaida in Iraq, controlled large tracts of the countryside.

Ishaqi, about 80 miles northwest of Baghdad, not far from Saddam Hussein's hometown, Tikrit, was considered so dangerous at the time that US military officials had classified all roads in the area as "black," meaning they were likely to be booby-trapped with roadside bombs.

The Ishaqi incident was unusual because it was brought to the world's attention by the Joint Coordination Center in Tikrit, a regional security center set up with American military assistance and staffed by US-trained Iraqi police officers.

The original incident report was signed by an Iraqi police colonel and made even more noteworthy because US-trained Iraqi police, including Brig. Gen. Issa al Juboori, who led the coordination center, were willing to speak about the investigation on the record even though it was critical of American forces.

Throughout the early investigation, US military spokesmen said that an al Qaida in Iraq suspect had been seized from a first-floor room after a fierce fight that had left the house he was hiding in a pile of rubble.

But the diplomatic cable provides a different sequence of events and lends credence to townspeople's claims that American forces destroyed the house after its residents had been shot.

Alston initially posed his questions to the US Embassy in Geneva, which passed them to Washington in the cable.

According to Alston's version of events, American troops approached a house in Ishaqi, which Alston refers to as "Al-Iss Haqi," that belonged to Faiz Harrat Al-Majma'ee, whom Alston identified as a farmer. The US troops were met with gunfire, Alston said, that lasted about 25 minutes.

After the firefight ended, Alston wrote, the "troops entered the house, handcuffed all residents and executed all of them. After the initial MNF intervention, a US air raid ensued that destroyed the house." The initials refer to the official name of the military coalition, the Multi-National Force.

Alston said "Iraqi TV stations broadcast from the scene and showed bodies of the victims (i.e. five children and four women) in the morgue of Tikrit. Autopsies carries (sic) out at the Tikrit Hospital's morgue revealed that all corpses were shot in the head and handcuffed."

The cable makes no mention any of the alleged shooting suspects being found or arrested at or near the house.

The cable closely tracks what neighbors told reporters for Knight Ridder at the time. (McClatchy purchased Knight Ridder in spring 2006.) Those neighbors said the US troops had approached the house at 2:30 a.m. and a firefight ensued. In addition to exchanging gunfire with someone in the house, the American troops were supported by helicopter gunships, which fired on the house.

The cable also backs the original report from the Joint Coordination Center, which said US forces entered the house while it was still standing. That first report noted: "The American forces gathered the family members in one room and executed 11 persons, including five children, four women and two men. Then they bombed the house, burned three vehicles and killed their animals."

The report was signed by Col. Fadhil Muhammed Khalaf, who was described in the document as the assistant chief of the Joint Coordination Center.

The cable also backs up the claims of the doctor who performed the autopsies, who told Knight Ridder "that all the victims had bullet shots in the head and all bodies were handcuffed."